JPS6135875B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The button neck wrapping sewing machine described in the precondition concept of claim 1 as a known item is equipped with a sewing material holder, and in this sewing material holder, A fixed distance between the button and the sewing item is given in advance. Therefore, the long button thread legs are not tensioned during sewing and winding, and there is a risk that the long button thread legs will be pierced during the sewing process. Also, if the thread leg loop is loose, the winding will result in an uneven shape, thereby detracting from the appearance of the finished button thread leg.

An object of the invention described in claim 1 is to create a sewing product holder for a button neck-wrapping sewing machine that can achieve a better form of winding a thread leg ring of a button to be sewn. . According to the measures of the invention, the yarn foot is wound during the winding process in a state that is taut and adapted for sewing.

The formation of the retaining element according to claim 2 results in a structure that is easy to use and can be used in a straightforward manner.

Hereinafter, the present invention will be explained in detail with reference to embodiments of the drawings.

The illustrated sewing machine has mounting base 1 (first
), consists of an upper arm 2 and a lower arm 3. An upper shaft (not shown) is mounted in the upper arm 2, and this upper shaft is connected to the lower arm for driving the needle bar 4 with the needle 5, and via communication units such as bevel gears, control shafts, etc. It is used to drive the looper 6 (Fig. 5) installed in the looper 3. The upper shaft itself communicates via a clutch 7 (FIG. 1) and a belt 8 with a drive motor arranged inside a table plate 9 carrying the sewing machine.

The clutch 7 consists of an idler wheel 10 loosely attached to the upper shaft in a known manner and a transmission pulley 11 rigidly connected to the upper shaft. Mounting stand 1
A brake 13 and a belt guide 14 are attached to an adjusting lever 12, which is rotatably arranged in the belt 12, through which the belt 8 is transferred from the idler wheel 10 to the transmission pulley 11.
Adjusting lever 12 configured as a bell crank
has one end projecting into the movement path of a transmission lever 16 rotatably arranged on the mounting base 1. The transmission lever can be controlled by the pedal plate via a coupling device constructed in a known manner and is used for coupling the drive motor to the upper shaft, during which coupling the mechanically acting brake 13 is simultaneously activated. It is rotated and removed.

The upper shaft drives the control shaft 17 via a reduction gear. A control disk 18 is fixed to the control shaft, and the control disk controls the movement of the push rod 20 via a control cam 19. For this purpose, the control cam 19 is fastened to the double lever 21 and rotates the double lever via a pin 22 that projects into the control cam 19.

The double lever 21 is rotatably mounted on a bearing pedestal 24 by a shaft 23 that is firmly connected to the double lever, and the bearing pedestal is fixed to the lower arm 3 of the sewing machine by a screw 25. The two parallel hanging strips of the double lever 21 are the guide path 26 of the toggle device 27.
The toggle device is fixed to the guide rod 28 so that its position can be adjusted. This guide rod is firmly connected to a push rod 20, and the push rod is fixed to a guide 2 fixed to the lower arm 3.
9 (Fig. 1).

The toggle device 27 consists of a sleeve-shaped body 30, the walls of which extend perpendicularly to the axis 23,
It has a hole 31 for accommodating a joint pin 32. A hole 33 in the coupling pin 32 is used to accommodate the guide rod 28. A screw 34 passing through a threaded hole 35 in the coupling pin 32 fixes the position of the toggle device 7 on the guide rod 28.

Push rod 2 that directs the stitch forming position of the sewing machine
A sewing product holder 36 (FIG. 4) is fixed to the end of the sewing machine 0 with a screw 37.

The sewing product holder 36 consists of a fixed guide 38 and a movable sliding piece 39. guide 38
is equipped with two horizontally oriented guide tongues 40 and an upwardly standing bearing arm 41. The bearing arm 41 has a screw hole 42 extending parallel to the lower arm 3, and a screw 43 is screwed into the screw hole.

Both guide tongues 40 of guide 38 and push rod 20
The slide 39 is movably mounted between the two, with the push rod 20 projecting into the cavity 44 of the slide 39. The sliding piece has two arms 45, which are guided by two guide tongues 40. The sliding piece 39 is provided with a bearing arm 46 which has a bore 47 extending coaxially with the threaded bore 42 and into which a slot 4 provided in the bearing arm 46 is inserted.
Interrupted by 8. A screw 43 projecting into the hole 47 is threaded into a knurled nut 49 passed through the slot 48.

The shank end of a U-shaped frame 50 is fixed to the guide 38, and the center portion of the frame 50 has a space 51, which is opened diagonally upward. Frame 5
Another frame 52 of smaller dimensions is placed inside 0,
The shank of this frame is fixed to a sliding piece 39. This frame 52 also has one void 53, the shape of this void corresponds to the shape of the void 51, and this void 51
It is formed coaxially with the lower arm 3 in the subordinate direction. Frame 5
0 and 52, their central portions are stuck up on a needle plate 54 fixed to the front end of the lower arm 3, and the needle plate is equipped with a needle hole (not shown), and the needle 5 is inserted into this needle hole. This allows the looper 6 to cooperate with the looper 6.
Blank spaces 51 and 53 in both frames 50 and 52 are filled with buttons 56
It is used for inserting a thread ring 55 that connects the thread to the sewing material 57.

A bearing 58 is fixed to one shank of the frame 50, and a lever 59 is mounted in this bearing. The forked end of the lever 59 surrounds the bent end of a cutter 60, which is passed through a slot 61 in the central portion of the frame 50. screw 62
Two guide plates 63 fixed to the central part by means and covering the inside and outside of the slot 61 are used to guide the cutter 60 inside the slot 61. A sliding rod 64 acts on the lever 59, and the sliding rod is connected to one arm of a bell crank 65 (FIG. 1). The bell crank 65 is mounted on a bearing 66 fixed to the upper arm 2 and connects the other arm with a pull rod 67, which is fixed to a double lever 68. The double lever 68 attached to the upper arm 2 by the joint pin 69 is
It communicates with an electromagnet 71 via a pull rod 70,
The electromagnet is housed in the sewing machine mount 1 and is briefly energized by the sewing machine control pulses following each sewing process.

Two guide brackets 72 (FIG. 5) are fixed below the throat plate 54, and a thread spreader 73 is passed through them in the longitudinal direction of the lower arm 3. The thread spreader 73 has a wedge-shaped tip 74 and a laterally projecting arm 75, which is connected to a bell crank 77.
It is inserted into a snap-shaped recess 76 of the holder. The bell crank 77 is attached to a shaft 78 fixed to the lower arm 3 and has a pull rod 79 (first
It communicates with the double lever 68 via the double lever 68 (Fig.). The spring 80 normally pulls the double lever 68 towards a stop 81 fixed to the upper arm 2.

The device operates as follows.

The workpiece 57 is inserted into the workpiece holder 36 with a button 56 connected to the workpiece by a thread ring 55, which thread ring 55 is inserted into both recesses 51 and 5.
3, in which case the sewing item 5
7 and button 56 are held apart by both frames 50 and 52. To adjust the thread hoop 55 to a longer or shorter length, both frames 50 and 52
The distance is adjusted by rotating the knurled nut 49. This knurled nut then moves over the screw 43 and, via the bearing arm 46, accompanies the sliding piece 39 mounted between the guide tongue 10 and the push rod 20.

By connecting the drive motor, the belt 8 moves on the idler wheel 10. The sewing machine is started by actuating the transmission lever 16 via a control connection (not shown) with the pedal plate. The transmission lever 16 then pivots the adjusting lever 12 so that the belt guide 14 moves the belt 8 from the idler wheel 10 onto the transmission pulley 1 and at the same time moves the mechanically acting brake 13 from the transmission pulley 11. unlock.

At the same time, control disc 18 pivots double lever 21 via control cam 19 and pin 22.
The double lever 51 swings out a toggle device 27 mounted in the guideway 26. body 3
The joint pin 32 installed in the guide rod 28
and move the push rod 20 in the axial direction of the lower arm 3 of the sewing machine. At this time, the sewing material holder 36 connected to the push rod 20 is brought along by the same amount.

Upon starting the sewing machine, the needle 5 stitches around the thread hoop 55 in a zigzag stitch in a known manner. The movement of the workpiece holder 36 by the control disc 18 is then such that the needle 5 stitches in the immediate vicinity of the workpiece 57 at the beginning of the sewing process, and then the stitch is displaced towards the button 56. The workpiece holder 36 is then pushed back again and the stitch formation is carried out again in such a way that it ends in the immediate vicinity of the workpiece 57 at the end of the sewing process.

Upon completion of the last stitch, control disc 18
The cam fixed to the adjusting lever 1
Activate 2. The adjustment lever 12 is the belt guide 1
4, the belt 8 is transferred from the transmission pulley 11 onto the idler wheel 10. The sewing machine has transmission pulley 11
It is stopped by a brake 13 connected to.

The control of the sewing machine causes, after the end of the sewing process, a brief energization of the electromagnet 71, which via the pull rod 70 rotates the double lever 68 by a fixed amount against the action of the spring 80. . The double lever 68 is connected to the bell crank 77 via a pull rod 79.
, whereby the bellcrank forces the tip 74 of the thread spreader 73 into the thread loop around the looper 6 and spreads the thread loop.

At the same time, the pivoting of the double lever 68 causes a pivoting of the lever 59 in its bearing 58 via the pull bar 67 and the slide bar 64. The cutter 60 then moves its blade from its final position towards the shank of the thread loop located on the left in FIG. 5, and the thread shank leading to the item to be sewn is cut by the cutter.

A thread ring 5 wrapped around a sewn button 56
The sewing item 57 with 5 is now manually removed from the sewing item holder 36. Changing the distance between the two frames 50 and 52 for working with a larger or smaller thread wheel 55 is carried out by turning the knurled nut 49, so that the frame 52 can be moved by the sliding piece. 39, the desired amount is set relative to the guide 38. The path of movement of the sewing material holder 36 to the changed distance between the two frames 50 and 52 is then adapted by a subsequent modification of the elevation position of the toggle device 27. After loosening the screw 34, the shaft 22
and the toggle device 27, thereby changing the travel distance of the push rod 20 and the sewing product holder 36, i.e. the control cam 19.
The length of the moving distance controlled by is also adjusted.

[Brief explanation of the drawing]

Figure 1 is a rear view of the sewing machine, Figure 2 is an enlarged sectional view of the transmission rod between the cam plate and push rod for driving the sewing product holder, and Figure 3 shows part of the toggle device inside the transmission rod. FIG. 4 is an enlarged perspective view showing a section, FIG. 4 is a perspective view of the sewing material holder, partially shown in cross section, and FIG. 5 is an enlarged perspective view of a portion of the sewing material holder. 6... Louver, 20... Push rod, 36... Sewing item holder, 50, 52... Frame, 55... Thread leg ring, 56... Button, 57... Sewing item, 60... Cutter, 73... ... Thread spreader, 74... Wedge-shaped tip.

Claims (1)

[Scope of Claims] 1. In a sewing machine for wrapping around buttons, the sewing machine has a sewing product holder for accommodating a sewing product with a button connected to the sewing product by a thread ring, in which the sewing product holder 3
6 is two holding elements 50, 5 which separate the sewing item 57 and the button 56 and whose mutual distance can be adjusted.
2. A sewing machine for wrapping a button around the neck. 2. The holding elements are formed as U-shaped frames 50, 52, of which one frame is fixed to the push rod 20 controlled by the sewing machine, the other frame is connected via an adjustable guide to the above-mentioned Claim 1 characterized in that it is connected to a fixed frame 50.
A sewing machine for wrapping the roots of buttons as described in section.